Linjalla
CLIENT Self-Published
CATEGORY iOS Navigation
YEAR 2026
ROLE Mobile App Development
Challenge
Commuters in Finnish cities needed a more visual, immediate way to see public transport locations than traditional timetable apps provided. The challenge was to handle real-time high-frequency data updates from public transit APIs Digitransit without draining battery or cluttering the UI, while maintaining smooth map interactions.
Solution
A native iOS application built with SwiftUI for high performance and responsiveness. The app consumes GTFS Realtime feeds to render vehicle positions on a MapKit interface. Smart data polling and local caching strategies ensure the app remains responsive even with spotty network connections. The design focuses on high contrast and quick interactions for on-the-go usage.
Key Features
- Real-time vehicle tracking on interactive map
- Live arrival estimates for stops
- Support for HSL (Helsinki) regions
- Minimalist, battery-efficient design
- Native iOS performance with SwiftUI
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